“Appraisal and Strengthen of Masonry Structure under Seismic Loading”

Abstract

In last decades, through further development of computer technology in civil engineering, so many different seismic analyses became possible and accuracy of the analysis is increased. Therefore there are lots of methodologies for seismic assessment in use. Many of the existing structure, which do not fulfill the current seismic requirements, may suffer extensive damage or even collapse if shaken by a severe ground motion. The aim of appraisal is to assess the seismic capacity of earthquake vulnerable structure or earthquake damaged structure for future use. The evaluation may also prove helpful for degree of intervention required in seismically deficient structures. The aim of seismic evaluation is to assess the possible seismic response of buildings, which may be seismically deficient or earthquake damage for its possible future use.  The seismic evaluation is helpful for retrofitting of the structure. Incremental Dynamic Analysis is an emerging structural analysis method that offers thorough seismic demand and limit-state capacity prediction capability by using a series of nonlinear dynamic analyses under a suite of multiply scaled ground motion records. Incremental Dynamic Analysis procedure is adopted here for the analysis of sample structure. A suite of seven selected ground motion time histories used to analyze Masonry Structure for performing Incremental Dynamic Analysis. The seismic performance of the Masonry Structure is quantified in terms of yield and collapse capacities in terms of various ground motion indices, which are derived from Incremental Dynamic Analysis curves. The yield capacity of the structure is defined as the level of Intensity at which the Incremental Dynamic Analysis curve leaves the linear path. The fragility curves for yielding and collapse damage levels are developed by statistically interpreting the results of the time-history analyses. Hazard-survival curves are generated by changing the horizontal axis of the fragility curves from ground motion intensities to their annual probability of exceedance using the log-log linear ground motion hazard model. The results express at a glance the probabilities of yielding and collapse against various levels of ground motion intensities.

Design software is used for analyzing the Masonry structure. Pushover analysis, Incremental dynamic Analysis and Fragility Analysis has been applied on Masonry structure. Present work can be used as the guideline for the seismic behavior of Masonry structure.